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In the wake of mounting criticism, Facebook executives are discussing changes to a controversial advertising tool that publicizes users' Web activities outside of the popular social network. Alterations to the recently introduced Beacon system could be announced as early as Nov. 29, BusinessWeek.com has learned. Executives of the three-year-old company were in deep talks over proposed changes late into the afternoon on Nov. 28, according to a person familiar with the matter. At issue is the Beacon program, which alerts members' Facebook "friends" to purchases and other activities on third-party Web sites. A spokesperson for the company declined to discuss changes, reiterating an earlier statement: "Facebook is listening to feedback from its users and committed to evolving Beacon."